From 45767fb1ae8d0da1daa14d716a26674f3d5d24b9 Mon Sep 17 00:00:00 2001
From: realtradam <mr.malczewski@gmail.com>
Date: Sat, 24 Apr 2021 01:24:46 -0400
Subject: .

---
 lib/camera/camera.rb                    | 108 ++++++++++++++++++++++++++++++++
 lib/camera/wrappers/image_wrapper.rb    |  73 +++++++++++++++++++++
 lib/camera/wrappers/square_wrapper.rb   |  73 +++++++++++++++++++++
 lib/camera/wrappers/triangle_wrapper.rb |  90 ++++++++++++++++++++++++++
 4 files changed, 344 insertions(+)
 create mode 100644 lib/camera/camera.rb
 create mode 100644 lib/camera/wrappers/image_wrapper.rb
 create mode 100644 lib/camera/wrappers/square_wrapper.rb
 create mode 100644 lib/camera/wrappers/triangle_wrapper.rb

diff --git a/lib/camera/camera.rb b/lib/camera/camera.rb
new file mode 100644
index 0000000..e5fd254
--- /dev/null
+++ b/lib/camera/camera.rb
@@ -0,0 +1,108 @@
+# frozen_string_literal: true
+
+Dir[File.join(__dir__, 'wrappers', '*.rb')].sort.each { |file| require file }
+
+# Handles rendering objects relative
+# to a camera location
+module Camera
+  class <<self
+
+    private
+    # Contains all objects that are tracked
+    def objects
+      @objects ||= []
+    end
+  end
+
+  def self.debug_x
+    @debug_x ||= 0
+  end
+
+  def self.debug_x=(debug_x)
+    @debug_x = debug_x
+  end
+
+  def self.debug_y
+    @debug_y ||= 0
+  end
+
+  def self.debug_y=(debug_y)
+    @debug_y = debug_y
+  end
+
+  # Adding objects so they are
+  # tracked by the Camera
+  def self.<<(item)
+    case item
+    when Triangle
+      item.extend Camera::TriangleWrapped
+      puts item.class
+    when Square
+      item.extend Camera::SquareWrapped
+    when Quad
+      item.extend Camera::QuadWrapped
+    when Line
+      item.extend Camera::LineWrapped
+    when Circle
+      item.extend Camera::CircleWrapped
+    when Image
+      item.extend Camera::ImageWrapped
+    when Sprite
+      item.extend Camera::SpriteWrapped
+    when Text
+      item.extend Camera::TextWrapped
+    else
+      puts 'Warning: Non-standard Object added to Camera'
+      puts 'Object may not behave as expected'
+    end
+    objects.push(item) unless objects.include?(item)
+  end
+
+  # Redraw all objects that
+  # are tracked by the Camera
+  def self.update
+    objects.each(&:update)
+  end
+
+  # Variables changing Camera properties
+  def self._x(x)
+    @x += x
+  end
+
+  def self._y(y)
+    @y += y
+  end
+
+  def self.x
+    @x ||= 0
+  end
+
+  def self.x=(x)
+    @x = x
+  end
+
+  def self.y
+    @y ||= 0
+  end
+
+  def self.y=(y)
+    @y = y
+  end
+
+  def self.zoom
+    @zoom ||= 1.0
+  end
+
+  def self.zoom=(zoom)
+    @zoom = zoom
+  end
+
+  def self.angle
+    @angle ||= 0
+  end
+
+  def self.angle=(angle)
+    angle %= 360
+    @angle = angle
+  end
+end
diff --git a/lib/camera/wrappers/image_wrapper.rb b/lib/camera/wrappers/image_wrapper.rb
new file mode 100644
index 0000000..3f603d4
--- /dev/null
+++ b/lib/camera/wrappers/image_wrapper.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+module Camera
+  # Wraps existing variables as well as adding new methods
+  # so that it can be handled by the Camera Module
+  module ImageWrapped
+    # Recalculates real coordiantes
+    # Use after changing variables
+    def update
+      angle = Camera.angle * (Math::PI / 180)
+      half_width = Window.width * 0.5
+      half_height = Window.height * 0.5
+      offset_x = x + (width / 2)
+      offset_y = y + (height / 2)
+      @x = (((offset_x - Camera.x) * Math.cos(angle)) - ((offset_y - Camera.y) * Math.sin(angle))) \
+        * Camera.zoom + half_width - (width * Camera.zoom / 2)
+      @y = (((offset_x - Camera.x) * Math.sin(angle)) + ((offset_y - Camera.y) * Math.cos(angle))) \
+        * Camera.zoom + half_height - (height * Camera.zoom / 2)
+      @rotate = rotate + Camera.angle
+      @width = width * Camera.zoom
+      @height = height * Camera.zoom
+    end
+
+    #Methods for moving the shape
+
+    # Wrappers for the coordinates so that
+    # they are handled by the Camera instead
+    # and for ease of programming
+    def x
+      @virtual_x ||= @x
+    end
+
+    def x=(x)
+      @virtual_x = x
+    end
+
+    def y
+      @virtual_y ||= @y
+    end
+
+    def y=(y)
+      @virtual_y = y
+    end
+
+    def x
+      @virtual_x ||= @x
+    end
+
+    def rotate
+      @virtual_rotate ||= @rotate
+    end
+
+    def rotate=(rotate)
+      @virtual_rotate = rotate
+    end
+
+    def width
+      @virtual_width ||= @width
+    end
+
+    def width=(width)
+      @virtual_width = width
+    end
+
+    def height
+      @virtual_height ||= @height
+    end
+
+    def height=(height)
+      @virtual_height = height
+    end
+  end
+end
diff --git a/lib/camera/wrappers/square_wrapper.rb b/lib/camera/wrappers/square_wrapper.rb
new file mode 100644
index 0000000..6cfd3f7
--- /dev/null
+++ b/lib/camera/wrappers/square_wrapper.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+module Camera
+  # Wraps existing variables as well as adding new methods
+  # so that it can be handled by the Camera Module
+  module SquareWrapped
+    # Recalculates real coordiantes
+    # Use after changing variables
+    def update
+      angle = Camera.angle * (Math::PI / 180)
+      half_width = Window.width * 0.5
+      half_height = Window.height * 0.5
+      offset_x = x + (width / 2)
+      offset_y = y + (height / 2)
+      @x = (((offset_x - Camera.x) * Math.cos(angle)) - ((offset_y - Camera.y) * Math.sin(angle))) \
+        * Camera.zoom + half_width - (width * Camera.zoom / 2)
+      @y = (((offset_x - Camera.x) * Math.sin(angle)) + ((offset_y - Camera.y) * Math.cos(angle))) \
+        * Camera.zoom + half_height - (height * Camera.zoom / 2)
+      @rotate = rotate + Camera.angle
+      @width = width * Camera.zoom
+      @height = height * Camera.zoom
+    end
+
+    #Methods for moving the shape
+
+    # Wrappers for the coordinates so that
+    # they are handled by the Camera instead
+    # and for ease of programming
+    def x
+      @virtual_x ||= @x
+    end
+
+    def x=(x)
+      @virtual_x = x
+    end
+
+    def y
+      @virtual_y ||= @y
+    end
+
+    def y=(y)
+      @virtual_y = y
+    end
+
+    def x
+      @virtual_x ||= @x
+    end
+
+    def rotate
+      @virtual_rotate ||= @rotate
+    end
+
+    def rotate=(rotate)
+      @virtual_rotate = rotate
+    end
+
+    def width
+      @virtual_width ||= @width
+    end
+
+    def width=(width)
+      @virtual_width = width
+    end
+
+    def height
+      @virtual_height ||= @height
+    end
+
+    def height=(height)
+      @virtual_height = height
+    end
+  end
+end
diff --git a/lib/camera/wrappers/triangle_wrapper.rb b/lib/camera/wrappers/triangle_wrapper.rb
new file mode 100644
index 0000000..46d8f35
--- /dev/null
+++ b/lib/camera/wrappers/triangle_wrapper.rb
@@ -0,0 +1,90 @@
+# frozen_string_literal: true
+
+module Camera
+# Wraps existing variables as well as adding new methods
+# so that it can be handled by the Camera Module
+  module TriangleWrapped
+    # Recalculates real coordiantes
+    # Use after changing variables
+    def update
+      angle = Camera.angle * (Math::PI / 180)
+      half_width = Window.width * 0.5
+      half_height = Window.height * 0.5
+      @x1 = (((x + x1 - Camera.x) * Math.cos(angle)) - ((y + y1 - Camera.y) * Math.sin(angle))) * Camera.zoom + half_width
+      @y1 = (((x + x1 - Camera.x) * Math.sin(angle)) + ((y + y1 - Camera.y) * Math.cos(angle))) * Camera.zoom + half_height
+      @x2 = (((x + x2 - Camera.x) * Math.cos(angle)) - ((y + y2 - Camera.y) * Math.sin(angle))) * Camera.zoom + half_width
+      @y2 = (((x + x2 - Camera.x) * Math.sin(angle)) + ((y + y2 - Camera.y) * Math.cos(angle))) * Camera.zoom + half_height
+      @x3 = (((x + x3 - Camera.x) * Math.cos(angle)) - ((y + y3 - Camera.y) * Math.sin(angle))) * Camera.zoom + half_width
+      @y3 = (((x + x3 - Camera.x) * Math.sin(angle)) + ((y + y3 - Camera.y) * Math.cos(angle))) * Camera.zoom + half_height
+    end
+
+    #Methods for moving the shape
+    def x
+      @x ||= x1
+    end
+
+    def x=(x)
+      @x = x
+    end
+
+    def y
+      @y ||= y1
+    end
+
+    def y=(y)
+      @y = y
+    end
+
+    # Wrappers for the coordinates so that
+    # they are handled by the Camera instead
+    # and for ease of programming
+    def x1
+      @virtual_x1 ||= @x1
+    end
+
+    def x1=(x1)
+      @virtual_x1 = x1
+    end
+
+    def y1
+      @virtual_y1 ||= @y1
+    end
+
+    def y1=(y1)
+      @virtual_y1 = y1
+    end
+
+    def x2
+      @virtual_x2 ||= @x2
+    end
+
+    def x2=(x2)
+      @virtual_x2 = x2
+    end
+
+    def y2
+      @virtual_y2 ||= @y2
+    end
+
+    def y2=(y2)
+      @virtual_y2 = y2
+    end
+
+    def x3
+      @virtual_x3 ||= @x3
+    end
+
+    def x3=(x3)
+      @virtual_x3 = x3
+    end
+
+    def y3
+      @virtual_y3 ||= @y3
+    end
+
+    def y3=(y3)
+      @virtual_y3 = y3
+    end
+  end
+end
+
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